Electric heating.



No. 848,163. PATENTED MAR. 26, 1907. S.S.EVELAND.

BLBGTRIG HEATING.

- APPLICATION FILED SEPT. 13, 1904.

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I and the heating eifect localized adjacent to ""ley an *UrrED s'rnr SAMUEL s. EVELAND, or PHIL s Pair reach.

lELPI'IIA, PENNSYLVANIA.

su-iorsio Hen-rims.

Specification of Letters Patent. I

Patented March 2c, 1907.

I I Application filed September 13, 1904:. Serial No. 224.3%.

To all whom it may concern:

Be it known that I, SAMUEL S. EVELAND, a citizen of the United States, residing at the city of Philadelphia, inthe county of Phila delphia and State of Pennsylvania, have indescent heating effectof a heating-circuit in such a way that the heat engendered is applied iu the locality where it is required for any metal-working operation.

The invention also comprises the improve ments to be presently'described and finally claimed. I

The nature, characteristic features, and scope of the invention will be more fully understood, from' the following description, taken in connection with the accompanying drawings, formingpart hereof, and in which- Figure 1 is a diagrammatic view. of apparatus capable of use inpractici'ng the invention, and Figs. 2 and 3 are respectively similar. views illustrating other types of appa- In the drawings, 1 is an'electrical contact having current-carrying abutting surfaces capable of nlovement,so that when the sur faces are moved the resistance is increased the contact. The heating eflect may of course be availed of for any useful purpose in metal-working. J i

As shownin the drawings, 2 are the conductors of the heating-circuit, and they constitute the secondary of. thetransf'ormer- 3,

whose primary circuit 4-is shown as including a generator 5. are shown for regulating the primary circuit. The pr mary circuit :5 ore-may be a usual Suitable, provisions, as 5*, L

heating-circuit-that is to say, one carrying current of comparatively large quantity and low voltage; Y As shown in Figs. 1 and 2, 6 is a conducting-support connected with one of the conductors A, and 7 is a part connected electrically, but so as to be capable of movement with the other conductor 2--as, for example, by means of the contact-brush 8. The part 7 is shown as ea able of rotation. ThlS is accomplishedin Big. 1 by means of the pulband 9 and in Fig. 2 by means of the pneumatic tool 10. The effect of rotating pneumatic tool'lO, Fig. 2.

trical contact 1, and thus increase the resistance.. Thepart 7 may be moved endwise, as by means of the rack and pinion 11 Fi 1 or b ad'ustin or ositioning the g y 3 g p The eifect of moving this. part endwise would be to s in a head on the and As shown in Fig. 3, the contact 1 is located between two piecesof work B and B, which are respective y to rotate, as has beendescribed in connection with the'part TofFig. 1, and, if desired,

so as to be endwise movable, as has been described in connection with that figure; .In this instance the heating effect will be localized in'the neighborhood of the contact 1,

and the pieces of work become highly heated at their abutting surfaces, so that they may be readily welded together'for example, by

upper end of the work A, F1gs. 1.

held in chucks mounted so as interrupting their rotation after they have been properly heatedand then pressing them toward each other. I

From the foregoing description it appears that the work A or B B constitutes the resistance-body of the heating-circuit.

' The invention isnot limited to the appa ratus described, which does not embody all .t es of-means .for moving the current-car rymg surfaces of the electrical contact, and it will be obvious. to those skilled in the art to which my invention appertains that modifications may-be made in detail without departing from the spirit thereof; nor is the in vention limited otherwise than may berequired by the prior state of the art; but,

Having thus described the nature and oh jects of my invention, what I claim as new,

and desire to secure by Letters Patent, is

Electric heating apparatus which consists in means for establishing electrical contact between substantially coextensive surfaces including a surface of the object to be heated, devices for passing current through said contact, and provisions for rubbing the same coextensive surfaces ofcontact together to localize the incandescent heating effect, substantially. as described.

In testimony whereof I have hereunto signed my name in the presence of two witnesses.

SAMUEL sIEVELANn' Witnesses i K. M. GILLIGAN, JAs. A. RroHMoNn. 

